Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103d4b8118b2927eff9c543f4654f4fc5720df439986d98641b9586f584421a8' 
  AND token = 'kwxrCfWoNjAtkHqOcfGg6rsu6e5Stk3LDngRSNvwlYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}